Aging and fatigue of ferroelectrets: combined experimental and theoretical study

铁电驻极体的老化和疲劳：实验与理论相结合的研究

• 批准号: 299327252
• 负责人: Professor Dr.-Ing. Heinz von Seggern
• 金额: --
• 依托单位: Fachgebiet Elektronische Materialeigenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/299327252?language=en
• 关键词: Aging; fatigue; ferroelectrets; combined; experimental

The objective is a combined experimental and theoretical study on the stability of the electromechanical properties of porous ferroelectrets. In particular, three different mechanisms which play influential roles in aging and fatigue of the ferroelectrets will be revealed. Firstly, the viscoelastic effect appears in both the porous polymer and the blocking bulk polymer. It leads to time- and temperature-dependent mechanical behavior of the material and thus influences the electromechanical properties of the ferroelectrets. To characterize the viscoelastic behavior uncharged ferroelectrets with different microstructure at different temperatures will first be experimentally and numerically studied. The gained knowledge will be then passed on to the study of charged ferroelectrets. Secondly, the interface charge decays with time due to the conductive relaxation of the porous polymer, i.e. the diffusion/drifting of charge carriers through the dielectric media. This conduction-induced discharge behavior is also temperature dependent. Since the interface charge is essential for the piezoelectric effect of ferroelectrets, the conduction-induced discharge plays an important role in the stability of their electromechanical property. Experimental investigations and theoretical model to take this discharge into account are planned. Thirdly, the interface charge can also change during the mechanically loading, when the electric field reaches the electric breakdown field due to configuration change. This breakdown-induced discharge is more likely to happen when the interface is charged on a high level and/or the mechanical loading is large. These three effects will be investigated in the present project through combined experimental and theoretical studies, results of which should guide the design of long-term and electromechanically stable ferroelectrets.

目的是结合实验和理论研究多孔铁电驻极体的机电性能的稳定性。特别是，将揭示在铁电驻极体老化和疲劳中发挥影响作用的三种不同机制。首先，多孔聚合物和嵌段本体聚合物均表现出粘弹性效应。它导致材料的时间和温度依赖性的机械行为，从而影响铁电驻极体的机电性能。为了表征不同温度下具有不同微结构的不带电铁电驻极体的粘弹性行为，首先将对它们进行实验和数值研究。所获得的知识将被传递到带电铁电驻极体的研究。其次，由于多孔聚合物的导电弛豫，即电荷载流子通过电介质的扩散/漂移，界面电荷随着时间而衰减。这种传导诱导的放电行为也依赖于温度。由于铁电驻极体的压电效应离不开界面电荷的存在，因此导电诱发放电对铁电驻极体的机电性能的稳定性起着重要的作用。实验研究和理论模型，以考虑到这种排放计划。 第三，在机械加载过程中，当电场达到电击穿场时，界面电荷也会发生变化。这种击穿诱导放电更可能发生在界面充电水平高和/或机械负载大时。这三种效应将在本项目中进行调查，通过结合实验和理论研究，其结果应指导长期和机电稳定的铁电驻极体的设计。

项目成果

Tubular fluoropolymer arrays with high piezoelectric response

• DOI: 10.1088/1361-665x/aa9a63
• 发表时间: 2017
• 期刊: Smart Materials and Structures
• 影响因子: 4.1
• 作者: S. Zhukov;Dagmar Eder-Goy;Corinna Biethan;S. Fedosov;Bai-Xiang Xu;H. von Seggern

Effect of degree of crystallographic texture on ferro- and piezoelectric properties of Ba0.85Ca0.15TiO3 piezoceramics

• DOI: 10.1111/jace.14749
• 发表时间: 2017-05
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: J. Schultheiß;O. Clemens;S. Zhukov;H. Seggern;W. Sakamoto;J. Koruza

Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores

• DOI: 10.1088/1361-6463/aa519c
• 发表时间: 2017-02-02
• 期刊: JOURNAL OF PHYSICS D-APPLIED PHYSICS
• 影响因子: 3.4
• 作者: Khachaturyan, R.;Zhukov, S.;Genenko, Y. A.
• 通讯作者: Genenko, Y. A.

Dynamic pull-in instability of a prestretched viscous dielectric elastomer under electric loading

• DOI: 10.1007/s00707-017-1930-4
• 发表时间: 2017-12-01
• 期刊: ACTA MECHANICA
• 影响因子: 2.7
• 作者: Eder-Goy, Dagmar;Zhao, Ying;Xu, Bai-Xiang
• 通讯作者: Xu, Bai-Xiang